package com.heima.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.search.dtos.UserSearchDto;
import com.heima.model.user.pojos.ApUser;
import com.heima.search.service.ApUserSearchService;
import com.heima.search.service.ArticleSearchService;
import com.heima.utils.thread.AppThreadLocalUtil;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Slf4j
@Service
public class ArticleSearchServiceImpl implements ArticleSearchService {
    //es
    @Autowired
    private RestHighLevelClient restHighLevelClient;
    //客户搜索历史记录
    @Autowired
    private ApUserSearchService apUserSearchService;

    /**
     * es文章分页检索
     *
     * @param dto
     * @return
     */
    @Override
    public ResponseResult search(UserSearchDto dto) throws IOException {
        //1.检查参数
        if (dto == null || StringUtils.isBlank(dto.getSearchWords())) {
            return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
        }

        //异步调用 客户搜索历史记录
        //获取用户id
        ApUser user = AppThreadLocalUtil.getUser();

        //dto.getFromIndex()==0,表示为首页
        if (user!= null && dto.getFromIndex() == 0) {
            apUserSearchService.insert(dto.getSearchWords(),user.getId());
        }


        //2.设置查询条件
        SearchRequest searchRequest = new SearchRequest("app_info_article");
        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //布尔查询
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        //关键字的分词之后查询
        QueryStringQueryBuilder queryStringQueryBuilder = QueryBuilders.queryStringQuery(dto.getSearchWords())
                //到那个域中查询
                .field("title")
                .field("content")
                //分词之后的条件是"或者"的关系
                .defaultOperator(Operator.OR);
        //添加进Boolean查询must相当于and的关系此条件参与算分
        boolQueryBuilder.must(queryStringQueryBuilder);

        //查询小于mindate的数据
        RangeQueryBuilder rangeQueryBuilder = QueryBuilders
                .rangeQuery("publishTime")
                .lt(dto.getMinBehotTime().getTime());
        //次查询条件不参与算分
        boolQueryBuilder.filter(rangeQueryBuilder);
        //分页查询
        searchSourceBuilder.from(0);
        searchSourceBuilder.size(dto.getPageSize());

        //按照发布时间倒序查询
        searchSourceBuilder.sort("publishTime", SortOrder.DESC);
        //设置高亮  title
        HighlightBuilder highlightBuilder = new HighlightBuilder();
        //要高亮的字段
        highlightBuilder.field("title");
        highlightBuilder.preTags("<font style='color: red; font-size: inherit;'>");
        highlightBuilder.postTags("</font>");
        searchSourceBuilder.highlighter(highlightBuilder);


        searchSourceBuilder.query(boolQueryBuilder);
        searchRequest.source(searchSourceBuilder);
        SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

        //3.结果封装返回

        List<Map> list = new ArrayList<>();
        SearchHit[] hits = searchResponse.getHits().getHits();
        for (SearchHit hit : hits) {
            String json = hit.getSourceAsString();
            Map map = JSON.parseObject(json, Map.class);
            //处理高亮
            if (hit.getHighlightFields() != null && hit.getHighlightFields().size() > 0) {
                String title = hit.getHighlightFields().get("title").getFragments().toString();
                //高亮标题
                map.put("h_title", title);
            } else {
                //未获取到高亮,原始标题
                map.put("h_title", map.get("title"));
            }
            list.add(map);
        }


        return ResponseResult.okResult(list);
    }
}
